Fern Austral Gem

A Beginner's Guide to the Austral Gem Fern | All you Need to Grow!

Family: Polypodiaceae
Common Names: Fern Austral Gem
Botanical Names: Asplenium dimorphum x difforme 
The Austral Gem Fern is a deceptive indoor plant! It may appear delicate, but its intricate fronds are surprisingly durable and not paper-thin like other delicate fern species. Most ferns prefer very high humidity to keep those tender leaves from drying out, but this durable fern can tolerate less moisture in the air and is more accepting of low-light environments than its relatives.


Most people assume ferns thrive in the shadows, but these houseplants need some light, so don't hide them in dark corners. Medium, indirect dappled light will bring out the best in them (picture them under a thick canopy of trees on a sunny day). Avoid direct sunlight, especially in the summer when the sun's rays are intense! The less light your ferns receive, the slower they will grow, and they may become leggy and thin. If you see this happening, immediately relocate your fern to a brighter spot! Learn more about what light is right for your indoor plants!


Ferns need constant moisture, but don't let them sit in standing water. Only certain types of wetland ferns can live in that environment. More importantly, do not neglect to water your fern. When that happens, you will find a dying fern surrounded by a ring of brown, crunchy leaves. Try this little trick if you are unsure how often to water your ferns. Water frequently, but lightly. Instead of soaking your ferns once a week or whenever you water your plants. Give them a little bit every few days, or just enough to keep the soil moist but not soggy. If the watering riddle still has you scratching your head, consider planting your ferns into self-watering planters, and don't forget to fill them in when they dry out!


The soil composition is critical when it comes to growing ferns! Ferns need a soil medium that can retain moisture but drain excess water to avoid the root rot. Most pre-mixed soils will suffice. Make sure that there is plenty of organic matter, like coco-coir, peat moss, or shredded leaves, and avoid soils that contain moisture retaining crystals. If your soil drains too quickly, we recommend re-potting your fern into a compost-rich soil mixture.  


Ferns adapt quickly to most household temperatures. They prefer to live in cooler temps but can withstand temperatures into the 90's. They'll need more water and shade during a heatwave. When the temperatures are hot and stagnant, we recommend using a fan to provide good air circulation! Moving air helps keep pests and diseases, and fungus away!


Humidity is a MUST to keep your fern strong and vigorous! If you think about the tropical rainforests where they naturally grow, it's easy to see why. A humidifier will be the best solution to raise the humidity in your home during the cold months when the forced-air heat is cranking and dries out the air. We do not recommend misting your ferns --or any plants -- as this can cause fungal diseases if the leaves are constantly wet. You would have to be misting all day for that to happen!. Misting does almost nothing to help raise the humidity for your plants, even though it feels therapeutic and relaxing to do! A stylish and practical way to increase the humidity in a small area is to place the ferns on a tray filled with pebbles and water so the evaporating moisture can reach the foliage. Learn how to increase humidity around your indoor plants!


Feed your ferns with a ¼-diluted complete liquid fertilizer twice a month during the growing season. You can add organic compost, worm castings, or a slow-release fertilizer. Keep in mind that ferns are sensitive to being over-fertilized, so always dilute and concentrated fertilizer before you apply it! Do not feed during the winter or in the colder months.

Growth Rate

Fern Austral Gem is a moderately slow grower and can reach a maximum height of 12" at maturity.

Pet Friend or Foe 

The Fern Austral Gem is Pet-friendly! Friend!

Pro Tips

  1. Only fertilize your indoor plants after you've saturated the soil with water; this avoids burning the roots and foliage. 
  2. Group ferns to make caring for them easier. 
  3. Leave your ferns in the grow pots or plant in nonporous pots as this helps keep their soil moist. 
  4. Indoor ferns can become root-bound which leads to stunted growth. Re-pot your ferns into a container that is 2" wider in diameter, using organic-rich soil when re-potting them! 
  5. A great time to divide your ferns is when you are re-potting them. Take a sharp sterilized knife and carefully slice the root ball in half, and plant each division into their new pots! 
  6. Try placing a fern potted in a terra-cotta pot into a larger ceramic pot. Place moistened moss between the inner terra-cotta pot and the outer ceramic pot. The moistened moss will help slow down the terra-cotta pot from wicking away the moisture from the fern's soil.

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